ISO 6119:2006

Overview

ISO 6119:2006 establishes standardized test methods and minimum performance requirements for elastomeric seals used in the hydraulic disc brake cylinders of road vehicles, specifically where non-petroleum base hydraulic brake fluid is used. Designed for seals exposed to service temperatures up to 120 °C, this standard applies to solid section seals such as square, rectangular, and O-rings, whether mounted stationary in the cylinder bore or on the movable piston. By specifying detailed testing protocols and product acceptance criteria, ISO 6119:2006 supports the manufacturing and quality assurance of reliable brake systems in the automotive sector.

Key Topics

• Scope: Applies to elastomeric seals for road vehicle disc brake cylinders using non-petroleum base fluids (like DOT 3, DOT 4, or DOT 5.1), and covers seals for both stationary and moving components.
• Product Requirements:
  • Seals must strictly conform to standardized drawings and be free from defects such as cracks, blisters, pinholes, embedded foreign matter, or irregularities detectable by inspection.
  • Suitable for continuous operation in a temperature range from −40 °C to +120 °C.
• Performance Test Methods:
  • Resistance to Fluid at Elevated Temperature: Assesses changes in volume and hardness after exposure to brake fluid at 120 °C.
  • Precipitation Characteristics: Measures sediment formation in brake fluid after seal exposure, limiting possible contamination.
  • Dry Air High-Temperature Resistance: Evaluates hardness and physical integrity after oven aging.
  • Stroking Tests: Simulates operational cycles at ambient and high temperatures to ensure no leakage or excessive wear.
  • Low-Temperature Leakage Test: Ensures seals remain flexible and do not crack at temperatures as low as −40 °C.
  • Corrosion and Humidity Testing: Exposes seals to high humidity and temperature cycles to confirm corrosion resistance and material stability.
• Test Fluids:
  • Uses reference brake fluids as defined by ISO 4926 for compatibility and corrosion tests.

Applications

ISO 6119:2006 plays a critical role in the design, manufacturing, and qualification of road vehicle disc brake systems that utilize non-petroleum-based hydraulic fluids. Its application ensures:

• Quality Assurance: Allows manufacturers to validate the durability and compatibility of elastomeric seals under severe operational conditions, reducing the risk of brake failure.
• Safety Compliance: Enables automotive OEMs and component suppliers to meet international safety and reliability standards, supporting global automotive trade.
• Material Selection & Compatibility: Guides engineers in selecting elastomer formulations that maintain integrity when exposed to non-petroleum brake fluids at a wide range of temperatures.
• Product Development: Serves as a benchmark for R&D, helping manufacturers innovate brake seal designs while ensuring compliance.
• End-user Confidence: Provides assurance to vehicle owners and maintenance professionals that brake components meet critical performance and safety benchmarks.

Related Standards

Organizations seeking to implement ISO 6119:2006 may also need to reference additional standards to ensure complete compliance and integration across brake system components, such as:

• ISO 48: Specifies methods for determining the hardness of rubber, essential for evaluating seal integrity.
• ISO 188: Outlines procedures for accelerated aging and heat resistance in rubbers.
• ISO 1817: Provides guidelines for assessing the effect of liquid exposure on rubber materials.
• ISO 4926: Defines reference fluids for testing compatibility in hydraulic brake systems.
• ISO 4928: Sets specifications for elastomeric cups and seals in hydraulic braking systems operating with non-petroleum-based fluids.

By adhering to ISO 6119:2006 and its related standards, manufacturers and suppliers enhance product reliability, safety, and international market access, while supporting the continued advancement of brake technology for modern road vehicles.